Because it is a Page Template and WP recognizes it as such. And on Pages the more thing does NOT work: normally on a Page you see the whole content because Pages' content is never "listed" on one file as in the case of posts on index or archives.

Ah, thank you moshu. That's a tad disappointing (for me) but makes perfect sense. It isn't really a big deal and I can live with it as it is, however, if someone has an idea for a workaround which wouldn't be too time consuming then I'd be interested in hearing it.